<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<header>头部</header>
<section>主体</section>
<footer>尾部</footer>
<hr>
<div class="header">头部</div>
<div class="section">主体</div>
<div class="footer">尾部</div>
</body>
</html>